Now she is in line to replace outgoing Committee Chairman Sir Kevin Barron, who quit after a stormy relationship with Mr Bercow and Leader of the Commons Andrea Leadsom over new rules that will allow MPs under investigation to remain anonymous.

Commons rules dictate that the role must be a Labour MP because it goes to a member of the official opposition.

The Speaker was accused of intimidating and bullying staff including his former private secretary Angus Sinclair

But despite the allegations, Mr Bercow escaped an investigation by the Parliamentary Standards Commissioner because Ms Green and two Tory MPs voted against a probe. Only two MPs on the committee backed an investigation into Mr Bercow’s behaviour.

Ms Green refused to respond to queries last night.

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